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13 January, 17:29

Which of the following pairs of elements can be joined by a covalent bond?

A. Na and C

B. Mg and C

C. Li and Cl

D. N and C

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Answers (1)
  1. 13 January, 19:52
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    Your teacher is probably expecting D.

    Explanation:

    If you have learned that metal + nonmetal ⟶ ionic bond, the answer is D, because N and C are the only pair of nonmetals.

    However, if you have learned that a bond is ionic if the electronegativity difference (ΔEN) between the two atoms is greater than 0.7, the answer is A, B, and D.

    The Li-Cl bond is definitely ionic.

    For Na and C, ΔEN = 1.62, so the Na-C bond is a highly polar covalent bond.

    For Mg and C, ΔEN = 1.24, so the Mg-C bond is a polar covalent.
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